Control a Stomp Whammy block with Line 6 exp pedal plugged into exp 1 jack on MC6?

I want button F on the MC6 to toggle on/off a whammy block on the HX Stomp and use a Line 6 expession pedal plugged into the exp 1 jack on the MC6 to execute the whammy effect. Is this possible? I am starting to think it cant be done. I have the exp 1 port configured for expression in the editor controller settings. Is there a step-by-step process anywhere that shows how do this? I hope so. Thanks in advance.